Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: DSATX Showing Under/Over temp at ~75F

  1. #1
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233

    DSATX Showing Under/Over temp at ~75F

    I'll Tarantino this for you, and describe the current symptom first, then describe how I arrived there.

    SYMPTOM: The DSATX does not power on when ACC is present. Upon disconnecting, and reconnecting VIN to the DSATX, the diagnostics LED blinks 4 times, indicating an under/over temp condition. I've touched the DSATX and it is at "room" temperature, and I'm in Southern California on an ~75F day, so it seems unlikely that it's under temperature.

    Steps I took to get to this state:

    First, the DSATX was working normally, and turning the computer on/off and providing power according to ACC being present. However, I was getting a nasty "pop" from my amps because the computer was powering off before the amp-on was turned off.

    I am using the "Amp On" functionality provided by pin F2 of JP1, so I assumed I could connect to the advanced functionality of the DSATX using a COM brain stem, and change advanced feature #25 "EARLYAUXCUT" to 1, making the amps turn off immediately, before the PC.

    I created an extension cable for the brain stem out of a couple wire jumpers from an old case I had hanging around, and hooked up the brainstem to the DSATX and COM1 of my car pc. It appeared to be hooked up correctly. The yellow/orange LED lit when connected only to the DSATX, and both yellow/orange and red LEDs lit when connected to the PC and DSATX.

    Upon first trying to start the computer, it started up, but after only a few seconds, it restarted/reset, presumably from the DSATX input.. Possibly not.

    Disconnecting the brain stem, resulted in "normal" behavior, and only shutting down when ACC was removed.

    I then connected the brain stem directly to the DSATX, without my home-made extension cable, and used a Serial cable to connect it to my car pc.

    The computer then started up, and stayed running, and I attempted to connect to the DSATX using HyperTerm. I used the settings from the manual 9600-8-N-1 No flow control. Upon connecting, I attempted typing in "S251" and pressing enter to set the "EARLYAUXCUT". I received no real feedback in the HyperTerm window, so I tried some other commands, including trying to get the diagnostics etc. Overall, I ended up with a "@" and "!" characters in the HyperTerm window.

    Assuming I may have successfully set the "EARLYAUXCUT" I shut the computer down by removing ACC. I then tried to start up the computer, and was unsuccessful.

    At this point, the symptom described above started.

    I suspect I may have accidentally set the operating temperature to some insanely low value while connected to the brain stem.

    My questions are...

    1) How do I troubleshoot further, and possibly reset the factory defaults of the DSATX?

    2) How do I successfully connect using the brain stem, and set/read settings from the DSATX?

    3) Will setting the "EARLYAUXCUT" successfully result in the behavior I'm after? I.E. Amplifiers turn off IMMEDIATELY before the car pc/DSATX?

    Thanks for reading this far, and thanks in advance for any guidance you can provide.

    I stopped troubleshooting in fear of making things works, and because when I get frustrated I stop thinking logically. :-(
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  2. #2
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    I've done a bit more searching, and answered one of my questions, and thought of a couple more.

    It looks like I can reset factory defaults using the brain stem connection.

    So, new questions..

    1) When I'm connected to the DSATX via a COM port, should I see some feedback in the HyperTerm window?

    2) If I leave the DSATX connected to a PC via the COM port, and the computer is starting up, is it normal for the computer to reset?

    3) Is it possible to connect to the DSATX and set the advanced settings when ACC is not present?

    Thanks again.
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  3. #3
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    Okay.. A bit further testing has (I think) revealed the problem.

    First, to clarify, I had to set the terminal encoding to "VT100" from "Auto" to get proper connectivity with the DSATX through HyperTerm.

    After doing so, I reset to factory defaults, and tried again. Same result.

    I then disconnected and reconnected power, and the diagnostics output revealed that the DSATX thought it was -68C. This was indoors, in southern california, probably actually +80F or so.

    Seems the temperature sensor failed around the same time that I was making some other changes. Made it seem like it was related, but I think it was co-incidence.

    How do I get this serviced? I'd rather not buy a whole 'nother one if the temp sensor is the only problem.

    Also, while I had my COM connection working, I tried setting the "EARLYAUXCUT" to 1 and instead of the whole command being on one line I.E.

    Code:
    S251
    It turned out that every character caused a new line.

    Code:
    S
    2
    5
    1
    Until I get it repaired, it doesn't much matter, but is that the correct way to set this advanced setting? Is it normal for it to print each character on a new line?

    Thanks!
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  4. #4
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,244
    Seems like a bunch of people are having issues with the brainstem.

    Here are some pointers.

    Don't Hot-Plug the brainstem! Hot plugging it causes it to hiccup the micro controller and causes weird results.

    If you do hot plug it and you want it to behave normal, do the following:

    Take a Jumper and short pins JP1 A2 and B2. Be very careful when you do this. (Don't randomly short out everything with tweezers.) Shorting A2 to B2 will reset any weirdness you created from hot-plugging your brainstem.

    Then when you want to set paramters you must (E)nable writing first. A capital E will then ask you if you want the DSATX to burn the EEPROM with new settings as you type. Yes. Then you won't get line feeds for every key as your typing an S command.

    F and O will turn on and off the Feed Diagnostic Output. If you type, you should see an echo. That means you have hyperterminal setup right.. If you type and you don't see anything, your not setup right.


    The brainstem is plugged in right if it goes into the 4 pin connector without trouble. The circuit board should not hit the white housing.


    -Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  5. #5
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    Hi Jeff,

    Thanks for the response.

    I successfully shorted pins A2 and B2, both with VIN & ACC present, and without.

    I then connected with the brainstem (temp still showing -68C) and typed

    Code:
    E
    y
    D
    y
    Then reset by bringing VIN & ACC low again. Still showing -68C.

    Also typing "E" and answering yes, didn't seem to make a difference when entering an "S" command.

    There is a chance that in the process of troubleshooting this, I may have shorted A1 to A2. At one point I confused that with the USER_SW pin pair and attached a switch to it. Not sure if I ever toggled the switch though.

    If I had, could that have ruined anything?

    Anything else to try, or should I just order a new PSU?

    Thanks again for your prompt help!

    P.S. I'm using a 9v battery at the moment to power the DSATX to communicate via the brainstem for the purposes of tweaking, and setting these settings, if that makes any sort of difference.
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  6. #6
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,244
    Quote Originally Posted by cherrybomb View Post
    Hi Jeff,

    Thanks for the response.

    I successfully shorted pins A2 and B2, both with VIN & ACC present, and without.

    I then connected with the brainstem (temp still showing -68C) and typed

    Code:
    E
    y
    D
    y
    Then reset by bringing VIN & ACC low again. Still showing -68C.

    Also typing "E" and answering yes, didn't seem to make a difference when entering an "S" command.

    There is a chance that in the process of troubleshooting this, I may have shorted A1 to A2. At one point I confused that with the USER_SW pin pair and attached a switch to it. Not sure if I ever toggled the switch though.

    If I had, could that have ruined anything?

    Anything else to try, or should I just order a new PSU?

    Thanks again for your prompt help!

    P.S. I'm using a 9v battery at the moment to power the DSATX to communicate via the brainstem for the purposes of tweaking, and setting these settings, if that makes any sort of difference.
    Is that the only thing that is messed up? Does the feed output read 9 volts ok?

    The 9 volt battery is fine. It works just fine if ACC is also held high.

    I guess you could have a fried temp sensor, but it would be the first time. That thing uses almost no power..

    If you have a volt meter you can measure the pins around U4 which is near P2. That is the temp sensor.

    Put the negative side of the Volt meter on the GND terminal lug where the power comes in for convenience, then Probe U4.

    The pin on U4 that is farthest away from the P2 pot should read .55 volts (20 degrees C).

    The other pin should read around 5 volts and then one should read 0 volts.
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  7. #7
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,244
    Quote Originally Posted by cherrybomb View Post
    Hi Jeff,

    Thanks for the response.

    I successfully shorted pins A2 and B2, both with VIN & ACC present, and without.

    I then connected with the brainstem (temp still showing -68C) and typed

    You mean you had the brainstem connected and then shorted the pins? The reset is to fix the effects of hot plugging the brainstem.
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  8. #8
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    Quote Originally Posted by zootjeff View Post
    You mean you had the brainstem connected and then shorted the pins? The reset is to fix the effects of hot plugging the brainstem.
    Yes, all of the above was with the brainstem physically attached.

    It wasn't until after I shorted the pins that I used HyperTerm to communicate, and do the "reset to factory defaults".
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  9. #9
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    Quote Originally Posted by zootjeff View Post
    Is that the only thing that is messed up? Does the feed output read 9 volts ok?

    The 9 volt battery is fine. It works just fine if ACC is also held high.

    I guess you could have a fried temp sensor, but it would be the first time. That thing uses almost no power..

    If you have a volt meter you can measure the pins around U4 which is near P2. That is the temp sensor.

    Put the negative side of the Volt meter on the GND terminal lug where the power comes in for convenience, then Probe U4.

    The pin on U4 that is farthest away from the P2 pot should read .55 volts (20 degrees C).

    The other pin should read around 5 volts and then one should read 0 volts.
    Sorry, just realized that you had responded twice.

    Looks like the VIN diagnostics is reading 00.00 volts. :-( The pins on U4 read approximately as you stated, so it sounds good. Perhaps I screwed something else up.

    Here's a couple diag output lines.

    Code:
    DSATX:-068.0:00.00:00.00:00.00:00.00:09.98:0000:NYNN:6:0000
    DSATX:-068.0:00.00:00.00:00.00:00.00:09.98:0000:NYNN:6:0000
    DSA:00.:00.00:0.0000.
    
    DSATX:-000:000:0.0:00.0AX:+E4.800.00:0.0:00.00:0.000:99
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

  10. #10
    Variable Bitrate cherrybomb's Avatar
    Join Date
    Apr 2005
    Location
    Southern Califorina
    Posts
    233
    Also, if it's of any further use. The board shows Rev 1.6, and the sticker on the back, which I assume is a serial number, is D432606.

    I'm getting the sense that I may have done something to cause the firmware to freak out, or I have a defective unit. Bummer. :-(
    '99 Ford Explorer Eddie Bauer
    CarPC Progress ~= 97%. Everything is installed, and operational. Still need to tweak and tune, and do some "finish" fabrication.
    CarPC Project Web Site

    SpaceNavigatorDriver SourceForge Project

    Check out my blog.

Page 1 of 2 12 LastLast

Similar Threads

  1. DSATX firmware bug?
    By zenfe in forum Power Supplies
    Replies: 10
    Last Post: 10-04-2008, 04:56 PM
  2. My DSATX 220w experience
    By tj!2k4 in forum Power Supplies
    Replies: 8
    Last Post: 11-16-2006, 09:47 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •